    var countdown = 60;
    function settime(obj) {
        if (countdown == 0) {
            obj.removeAttribute("disabled");
            obj.value = "获取验证码";
            countdown = 60;
            return;
        } else {
            obj.setAttribute("disabled", true);
            obj.value = "重新发送(" + countdown + ")";
            countdown--;
        }
        setTimeout(function () {
            settime(obj)
        }
            , 1000)
    }
